Tube frame



FIG. 1 is a top perspective view of a tube frame of the present invention;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view of a tube frame of the present invention.

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof.

The broken lines depict portions of the tube frame that form no part of the claimed design. 

CLAIM The ornamental design for a tube frame, as shown and described. 